01:判断数正负

#include

int main(void)

{

int num;

scanf("%d", &num);

if (num > 0) {

printf("positive\n");

} else if (num == 0) {

printf("zero\n");

} else {

printf("negative\n");

}

return 0;

}

02:输出绝对值

#include

#include

int main(void)

{

double num;

scanf("%lf", &num);

num = fabs(num);/* 调用了 fabs() 这一个求绝对值的函数*/

printf("%.2lf\n", num);

return 0;

}

03:奇偶数判断

#include

int main(void)

{

int num;

scanf("%d", &num);

if (num % 2 == 0)

printf("even\n");

else

printf("odd\n");

return 0;

}

04:奇偶ASCII值判断

#include

int main(void)

{

char c;

scanf("%c", &c);

if(c % 2 == 0)

printf("NO\n");

else

printf("YES\n");

return 0;

}

05:整数大小比较

#include

int main(void)

{

/* 注意一下 x 和 y 的范围 */

long long x, y;

scanf("%lld%lld", &x, &y);

if (x > y) {

printf(">\n");

} else if (x == y) {

printf("=\n");

} else {

printf("

}

return 0;

}

06:判断是否为两位数

#include

int main(void)

{

int num;

scanf("%d", &num);

if (num >= 10 && num <= 99)

printf("1\n");

else

printf("0\n");

return 0;

}

07:收集瓶盖赢大奖

#include

int main(void)

{

int num_1, num_2;

scanf("%d%d", &num_1, &num_2);

if (num_1 >= 10 || num_2 >= 20)

printf("1\n");

else

printf("0\n");

return 0;

}

08:判断一个数能否同时被3和5整除

#include

int main(void)

{

int num;

scanf("%d", &num);

if ((num % 3 == 0) && (num % 5 == 0))

printf("YES\n");

else

printf("NO\n");

return 0;

}

09:判断能否被3，5，7整除

#include

#include

int main(void)

{

bool flag = false;/* 设定一个标志位 */

int num;

scanf("%d", &num);

if (num % 3 == 0) {

printf("3 ");

flag = true;

}

if (num % 5 == 0) {

printf("5 ");

flag = true;

}

if (num % 7 == 0) {

printf("7 ");

flag = true;

}

if (flag == false)

printf("n\n");

return 0;

}

10:有一门课不及格的学生

#include

int main(void)

{

int counter = 0; /* 记录不及格科目的数量 */

int score_1, score_2;

scanf("%d%d", &score_1, &score_2);

if (score_1 < 60)

counter++;

if (score_2 < 60)

counter++;

if (counter == 1)

printf("1\n");

else

printf("0\n");

return 0;

}

11:晶晶赴约会

#include

int main(void)

{

int day;

scanf("%d", &day);

if (day == 1 || day == 3 || day == 5)

printf("NO\n");

else

printf("YES\n");

return 0;

}

12:骑车与走路

#include

int main(void)

{

int distance;

scanf("%d", &distance);

if (distance < 100) { /* 用数学方法可以求得临界距离为100 */

printf("Walk\n");

} else if (distance == 100) {

printf("All\n");

} else {

printf("Bike\n");

}

return 0;

}

13:分段函数

#include

int main(void)

{

double x;

scanf("%lf", &x);

double y = 0.0;

if (x >= 0 && x < 5) {

y = -x + 2.5;

} else if (x >= 5 && x < 10) {

y = 2 - 1.5 * (x - 3) * (x - 3);

} else {

y = x / 2 - 1.5;

}

printf("%.3lf\n", y);

return 0;

}

15:最大数输出

#include

int main(void)

{

int a, b, c;

scanf("%d%d%d", &a, &b, &c);

if (a > b) {

int temp = a;

a = b;

b = temp;

}

if (b > c) {

int temp = b;

b = c;

c = temp;

}

printf("%d\n", c); /* 经过两轮交换，c一定是最大的 */

return 0;

}

16:三角形判断

#include

int main(void)

{

int a, b, c;

scanf("%d%d%d", &a, &b, &c);

if ((a + b > c) && (a - b < c))

printf("yes\n");

else

printf("no\n");

return 0;

}

17:判断闰年

#include

int main(void)

{

int year;

scanf("%d", &year);

/* 闰年是能被400整除，或者是能被4整除但是不能被100整除的年份 */

if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0))

printf("Y\n");

else

printf("N\n");

return 0;

}

18:点和正方形的关系

#include

int main(void)

{

int x, y;

scanf("%d%d", &x, &y);

if(-1 <= x && x <= 1 && -1 <= y && y <= 1)

printf("yes");

else

printf("no");

return 0;

}

19:简单计算器

#include

int main(void)

{

int a, b, c;

char ch;

scanf("%d%d %c", &a, &b, &ch);/* 在%c前加一个空格，不然程序会出问题 */

switch (ch)

{

case '+':

{

c = a + b;

printf("%d\n", c);

break;

}

case '-':

{

c = a - b;

printf("%d\n", c);

break;

}

case '*':

{

c = a * b;

printf("%d\n", c);

break;

}

case '/':

{

if (b == 0) {

printf("Divided by zero!\n");

} else {

c = a / b;

printf("%d\n", c);

}

break;

}

default:

{

printf("Invalid operator!\n");

break;

}

}

return 0;

}

20:求一元二次方程的根

这道题涉及到了浮点型数的精度问题，博主建议初学者不用太过细究

#include

#include

int main(void)

{

float a, b, c;

scanf("%f%f%f", &a, &b, &c);

if(b * b == 4 * a * c)

{

if(b == 0)

printf("x1=x2=%.5f\n", b / (2 * a));

else

printf("x1=x2=%.5f\n", (-b) / (2 * a));

}

else if(b * b > 4 * a * c)

printf("x1=%.5f;x2=%.5f\n", (-b + sqrtf((b * b - 4 * a *c))) / (2 * a), (-b - sqrtf(b * b - 4 * a * c)) / (2 * a));

else

{

if(b == 0)

printf("x1=%.5f+%.5fi;x2=%.5f-%.5fi\n", b / (2 * a), sqrtf(4 * a * c - b * b) / (2 * a), b / (2 * a), sqrtf(4 * a * c - b * b) / (2 * a));

else

printf("x1=%.5f+%.5fi;x2=%.5f-%.5fi\n", -b / (2 * a), sqrtf(4 * a * c - b * b) / (2 * a), -b / (2 * a), sqrtf(4 * a * c - b * b) / (2 * a));

}

return 0;

}

21:苹果和虫子2

#include

int main(void)

{

int n, x, y;

scanf("%d%d%d", &n, &x, &y);

if (y >= n * x) /* 苹果吃完了 */

printf("0\n");

else if (y % x == 0) /* 苹果没有吃完 */

printf("%d\n", n - y / x);

else

printf("%d\n", n - y / x - 1);

return 0;

}

写在最后

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来源：https://www.cnblogs.com/liuzhaotong/p/12193975.html